Furnace - Household Furnaces

Household Furnaces

A household furnace is a major appliance that is permanently installed to provide heat to an interior space through intermediary fluid movement, which may be air, steam, or hot water. The most common fuel source for modern furnaces in the United States is natural gas; other common fuel sources include LPG (liquefied petroleum gas), fuel oil, coal or wood. In some cases electrical resistance heating is used as the source of heat, especially where the cost of electricity is low.

Combustion furnaces always need to be vented to the outside. Traditionally, this was through a chimney, which tends to expel heat along with the exhaust. Modern high-efficiency furnaces can be 98% efficient and operate without a chimney. The small amount of waste gas and heat are mechanically ventilated through a small tube through the side or roof of the house.

Modern household furnaces are classified as condensing or non-condensing based on their efficiency in extracting heat from the exhaust gases. Furnaces with efficiencies greater than approximately 89% extract so much heat from the exhaust that water vapor in the exhaust condenses; they are referred to as condensing furnaces. Such furnaces must be designed to avoid the corrosion that this highly acidic condensate might cause and may need to include a condensate pump to remove the accumulated water. Condensing furnaces can typically deliver heating savings of 20%-35% assuming the old furnace was in the 60% Annual Fuel Utilization Efficiency (AFUE) range.

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Other articles related to "household furnaces, furnace, household":

Industrial Furnaces - Household Furnaces - Heat Distribution
... The furnace transfers heat to the living space of the building through an intermediary distribution system ... distribution is through hot water (or other fluid) or through steam, then the furnace is more commonly called a boiler ... One advantage of a boiler is that the furnace can provide hot water for bathing and washing dishes, rather than requiring a separate water heater ...
Standard Industrial Classification
... Homes 2452 Prefabricated Wood Bldgs Components 2510 Household Furniture 2511 Wood Household Furniture, (No Upholstered) 2520 Office Furniture 2522 Office Furniture (No Wood) 2531 Public Bldg ...

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